Rotary blower.



,A. JENDRUSIK -ROTARY BLOWER. APPLICATION IILBD nov. 21, 1912.

Patented Apr. 15,1913.

UNITED STATES PATENT OFFICE.

ALEKSANDER JENDRUSIK, OF DABROWA-GORNICZA, RUSSIA, ASSIGNOR OF ONE-HALF TO STANISLAW' CZOJ'KOWSKI, OF DABROWA-GORNICQA, RUSSIA.

ROTARY BLOWER.

Specification of Letters Patent.

Patented Apr. 15, 1913.

To all whom it may concern Be it known that I, ALEksANDER JEN- DRUSIK, a subject of the Czar of Russia, and.

My invention relates to improvements in that type of rotary blower which comprises two rotating members engaging in each other, and running in a common casing. A known form of blower of this type comprises rotating members each consisting of a drum having tooth-like blades and recesses adjacent to said blades, these recesses being engaged by the blades of the other drum. Hence that space between-the rotating members which is so prejudicial to the efliciency of the blower is thereby reduced to a minimum. The said known form of blower, however, works satisfactorily only when the gases propelled by the blower are perfectly clean. Should these gases be charged with coal or metallic particles, such as occurs at gasworks, zincworks and so on, the said particles cling firmly to the outer surfaces of the drum, and, owing to the two drums bearing againsteach other, become so compressed that at length a crust forms on the drums which either damages their outer surfaces or may even cause a stoppage of the plant.

A primary object of my invention is to obviate this defect, and to this end I keep the diametral distance between the tips of opposite blades the same in each drum, but I arrange that the drums themselves are of different diameters. Owing to the different peripheral speeds at the drum surfaces so obtained itispos'siblc to prevent the said coal or metallic particles from adhering.

One illustrative embodiment of my invention is represented by way of example in the accompanying drawing, which shows a transverse section of my improved blower.

The casing 1 of the blower contains the drums 3, 4 mounted on the shafts 2 suitably driven, said drums being provided in known manner with the recesses 5, 6. I Extending from the drums and adjacent to said recesses are the blades 7, 8, which have a cross-section to suit the purpose of employment of the blower. The diametral distance between opposite blade-tips are kept equal, but the diameters of the drums themselves are now made unequal, in the example illustrated the drum 3 is of smaller diameter than the drum 4. Now when both drums, together with the blades thereon, are rotated in the directions indicated by the arrows, the blades on each drum engage or gear in known manner in the recesses in the other drum, and since the diameters from tip to tip of the blades are equal in the two drums the blades gear perfectly in the recesses. Since however the diameters of the drums themselves are unequal the peripheral speeds at the external surfaces of the drum are unequal, and when these surfaces abut the one surface runs somewhat faster than the other. Owing to these surfaces thus slidingover one another any coal-dust, metallic orsolid matter contained in the said gases and settling on the drum surfaces will be automaticallyremoved, and cannot possibly become compressed or caked on the drums. In this manner the surfaces are continually kept clean.

I claim In a rotary blower of the character described the combination of a casing and two rotatable drums journaled therein and adapted to abut against each other, one of said drums being of larger diameterat its cylindrical surface than the other, and each drum'having a pair of blades symmetrically disposed about and on diametrically opposite sides of its axis, and adapted to engage in corresponding recesses in the other drum, the diametral distances between the tipsof said blades being equal in each of said drums.

In testimony, that 1 claim the foregoing as my invention, I have signed my name in presence of two subscribing witnesses.

ALEKSA'N'DER JENDRUSIK.

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